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#include <bits/stdc++.h>
#define NMAX 505
#define INF 1e12
using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
typedef long long int var;
var P[NMAX],M[NMAX][NMAX];
int main()
{
ios :: sync_with_stdio(false);
fin.tie(NULL);
int n;
fin >> n;
for(int i = 0; i <= n ; i++)
fin >> P[i];
for(int step = 1; step < n; step++)
for(int i = 1,j = 1; i <= n - step; i++){
j = step + i;
M[i][j] = INF;
for(int k = i; k < j; k++){
M[i][j] = min(M[i][j],M[i][k] + M[k + 1][j] + P[i - 1] * P[k] * P[j]);
}
}
fout << M[1][n];
return 0;
}